Hello i have disabled again all plugins and left only Set password active and i have the same issue. White screen on subsites. I also added wp_debug to wp-config but no errors are shown on the white page.

I added this define( 'WP_DEBUG', true ); to my wp-config

I have discovered that i had Profile builder plugin activate on the subsites. That made the conflict.

I was doing some further testing with both plugins installed on my end and I noticed that both plugins are using same function name and it looks like that is causing this.

Here is something you could try.
Access your WP installation via FTP and navigate to wp-content/plugins/signup-password/ folder.
From there download and edit signup-password.php file and on lines 49 and 128 you should see this part in code:signup_password_random_password_filter
Simply try replacing those two strings with this:wpmu_signup_password_random_password_filter
Upload file back to your server and that should be it.

Please let me know if everything is working after that and I will notify plugin developer about this so we can add this in next plugin update.

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